Automotive Bumper Txhaj Moulding txheej txheem

Automotive bumpers muab faib ua pem hauv ntej thiab nram qab bumpers, feem ntau yog ua los ntawm hloov polypropylene (PP + EPDM + talc) khoom. Lawv yog tsim los siv loj kab rov tav txhaj molding tshuab. Tag nrho cov txheej txheem tsim khoom muaj cov kauj ruam hauv qab no: raw khoom ua ntej- kev kho mob → txhaj tshuaj molding → ntu tshem tawm thiab txiav → ua ntej- tshuaj tsuag → pleev xim → sib dhos thiab tshuaj xyuas → cia. Hauv qab no yog cov lus piav qhia ntxaws txog txhua theem.

 

I. Raw Material Pre-kev kho mob (Cov khoom xyaw ziab)

 

1. Cov khoom sib xyaw

Cov khoom tseem ceeb: Hloov PP pellets; Cov ntaub ntawv pabcuam: Xim masterbatch, tiv thaiv- tus neeg saib xyuas kev laus, tus neeg sawv cev tawv, thiab cov khoom siv rov ua dua tshiab (hauv qhov sib npaug).

Ntxiv cov khoom xyaw raws li cov mis rau hauv lub siab - sib tov ceev thiab sib tov kom huv si kom muaj xim zoo ib yam thiab ua haujlwm zoo.

 

2. Kev ziab thiab dehumidification

PP muaj qhov nqus dej tsawg, tab sis cov dej noo ntau dhau tuaj yeem ua rau cov nyiaj streaks thiab npuas hauv cov khoom. Siv lub tshuab cua kub kom qhuav ntawm 80-90℃rau 2-4 teev, tswj cov dej noo hauv qab 0.05%.

 

3. Kev pub mis thiab xa khoom

Tom qab ziab, cov pellets tau txais kev xa mus rau hauv lub tshuab txhaj tshuaj molding tshuab hopper los ntawm kev pub mis tsis siv neeg, ua kom muaj txheej txheem ntim tag nrho los tiv thaiv kev nqus noo noo thiab plua plav paug.

 

 

II. Txhaj Molding (Core Process)

 

1. Pwm Preheating thiab khoom teeb tsa

Loj bumper pwm yog nruab nrog kub khiav tshuab. Ua ntej, ua kom kub kub khiav mus rau 200-230 degree, thiab tswj cov pwm kub ntawm pwm kub tswj ntawm 40-60 degree. Kho qhov txhaj tshuaj siab, ceev, tuav lub siab, thiab lub sijhawm txias txias.

 

2. Clamping

Lub tshuab txhaj tshuaj molding lub tshuab clamping siv lub siab siab los kaw cov pwm. Lub clamping quab yuam feem ntau yog li ntawm 1800 mus rau 4000 tons (tsawg kawg yog nyias nyias -cov khoom siv phab ntsa), xyuas kom tsis muaj flash tshwm sim ntawm txoj kab sib faib.

 

3. Txhaj thiab ntim

Lub tshuab cua sov yog zonally tswj: nram qab cheeb tsam ntawm 170℃→ nruab nrab cheeb tsam ntawm 190-210℃→ nozzle ntawm 210-230 degree. Tom qab cov ntsia hlau noj, yaj cov khoom PP yog txhaj rau ntawm qhov kub siab thiab tshaj tawm los ntawm qhov kub khiav thiab lub rooj vag mus rau hauv cov kab noj hniav, kom ua tiav cov txheej txheem ntawm nyias - cov phab ntsa tsis muaj kev txhaj tshuaj luv luv lossis cov kab txuas.

 

4. tuav lub siab thiab ntim

Tom qab sau, hloov mus rau tuav lub siab kom them rau qhov shrinkage thaum lub sij hawm solidification, tiv thaiv cov cim dab dej, warping, thiab qhov sib txawv ntawm qhov sib txawv ntawm lub bumper.

 

5. Cua txias thiab Solidification (Tib kauj ruam tseem ceeb)

Internal circulating cooling dej quab yuam kom pwm txias, accounting rau ntau tshaj 60% ntawm tag nrho cov sij hawm voj voog. Nrog rau phab ntsa thickness ntawm 2.5-3.5 hli, lub sij hawm txias yog li ntawm 40 mus rau 90 vib nas this, kom txaus txias kom tsis txhob deformation thaum ejection.

 

6. Ua ntej-Tshaj tawm, Pwm Qhib, thiab Ejection

Cov ntsia hlau ua ntej- so kom tso siab, thiab lub tshuab maj mam qhib lub pwm. Cov pwm ejector pins thiab ejector blocks ib txhij thawb tawm lub bumper, thaum lub caj npab neeg hlau nkag mus rau hauv pwm kom tshem tawm qhov.

 

7. Robotic Part Tshem tawm thiab tso rau ntawm khib

Ib lub siab rau -axis lossis peb-axis neeg hlau maj mam tshem tawm lub bumper thiab muab nws tiaj tus rau hauv kev cai - zoo li khib. stacking los yog squeezing yog nruj me ntsis txwv tsis pub kom tsis txhob deformation los yog khawb.

Txhaj voj voog ib lub bumper: 70-120 vib nas this, nyob ntawm qhov loj me thiab kev ua kom txias.

 

III. Offline Post-Kev Ua Haujlwm (Kev Txhaj Tshuaj Molding Semi-Cov khoom tiav)

 

1. Kev ceev / Robotic Trimming:Tshem tawm cov rooj vag, cov neeg khiav dej num, teeb nyem los ntawm cov kab sib cais, thiab cov khoom siv ntau dhau ntawm snap- haum thaj chaw; rau cov contours nyuaj, siv CNC trimming robots kom cov npoo du.

2. Initial Defect Inspection:Kev tshuaj xyuas qhov muag rau kev txhaj tshuaj luv luv, npuas, nyiaj streaks, shrinkage, weld kab, khawb, deformation, thiab xim txawv; Cov khoom tsis zoo yog rov ua dua tshiab los yog crushed rau kev rov ua dua tshiab.

3. Shaping thiab Aging:Muab ib nrab-cov khoom tiav ntawm qhov kub thiab txias-tswj racks rau 1-4 teev kom txo tau cov kev ntxhov siab sab hauv thiab txo qis cov tshuaj tsuag txheej tom qab deformation; me me deformations raug kho siv cov khoom txias.

4. Sanding thiab plua plav tshem tawm:Cov xuab zeb me me uas xav tau txheej txheej los txhim kho adhesion; siv siab- rab phom cua ua ke nrog electrostatic plua plav collectors kom tshem tawm cov plua plav saum npoo.

 

 

IV. Txau Painting Kab Ntau Lawm (Cov Txheej Txheem Txheej Txheem rau Bumper Appearance)

 

1. Ua ntej-kev kho mob:Degreasing thiab ntxuav dej

Alkaline degreasing → dej ntxuav → deg txias → phosphating → deionized dej yaug → ziab. Tshem tawm cov pwm tso tawm, cov roj stains, thiab plua plav. Phosphating zaj duab xis txhim kho xim adhesion; ziab kub: 80-120 degree.

 

2. Electrostatic Plua plav tshem tawm

Ionized huab cua neutralizes nto hluav taws xob zoo li qub thiab tshuab tawm cov plua plav zoo los tiv thaiv cov tshuaj tsuag tsis xws luag.

 

3. Primer Txheej (Epoxy / Yas-Tshwj xeeb Primer)

Tsis siv neeg electrostatic tsuag siv primer nrog ib zaj duab xis tuab ntawm 15-25 μm, ua raws li qis -kub curing. Lub hom phiaj: npog lub substrate, txhim kho adhesion rau nruab nrab -coat, thiab zais me me imperfections.

 

4. Nruab nrab -Cov ntawv thov lub tsho

Fills nplua khawb thiab pinholes, txhim kho topcoat fullness, ces kho los ntawm ci.

 

5. Xim Topcoat (Lub Cev - Xim Xim)

Automated electrostatic spraying siv lub cev -xim xim xim, kom tsis txhob muaj xim txawv ntawm lub tsheb. Cov hlau tiav yuav tsum muaj ob lub tsho loj: lub hauv paus xim + lub tsho ntshiab.

 

6. Clear Coat Application (Gloss Protection)

Transparent lub tsho tiv no muab gloss, huab cua tsis kam, thiab khawb tsis kam nrog zaj duab xis thickness ntawm 30-50 μm.

 

7. Siab -Tsub Kho

Ci hauv qhov cub ntawm 80-140℃rau 20-40 feeb kom ua tiav zaj duab xis kho.

 

8. Kev soj ntsuam zaum kawg

Tshawb xyuas cov xim sib txawv, sagging, txiv kab ntxwv tev, pinholes, nco-txhaj tshuaj, thiab gloss uniformity. Cov khoom tsis raug yog rov ua dua thiab rov ua dua.

 

V. Kev sib dhos thiab kev tshuaj xyuas cov khoom tiav

 

1. Cov khoom sib dhos:Nruab cov khoom siv nrog rau lub teeb taws teeb, cov hniav nyiaj hniav kub, radar mounting bases, clips, tsis ua npuas ncauj, trim strips, thiab chrome trim pieces.

2. Dimensional Tag Nrho Kev Tshuaj Xyuas:Siv lub tshuab ntsuas kev sib koom tes lossis cov khoom siv tshuaj ntsuam xyuas kom paub tseeb tias qhov chaw teeb tsa lub qhov, qhov ntev ntawm lub contour, thiab haum cov kev tshem tawm kom paub meej tias lub tsheb haum.

3. Kev Ua Haujlwm thiab Kev Pom Zoo Re-kev tshuaj xyuas:Tshawb xyuas cov xim pleev xim, sib dhos xoob, tawg clips, thiab qhov tseeb ntawm qhov chaw radar.

4. Daim ntawv lo thiab zaj duab xis thov:Siv cov ntawv cim tsheb thiab cov yeeb yaj kiab tiv thaiv kom tsis txhob khawb thaum thauj.

6. Ntim thiab warehouse

Cov npog npog tiav yog qhwv rau hauv PE tiv thaiv zaj duab xis thiab muab txheej txheej los ntawm txheej rau ntawm kev thauj mus los racks, ces xa mus rau lub tsheb tsim lub tsev khaws khoom rau kev sib dhos.

 

Ntxiv:Cov Khoom Siv Khoom Siv Khoom Siv Rov Qab

Sprue rooj vag thiab cov khoom tsis raug tsim los ntawm kev txhaj tshuaj molding thiab trimming yog crushed los ntawm ib tug shredder, qhuav, thiab ces muab rov qab mus rau hauv cov ntaub ntawv raw ntawm ib qho piv txwv rau re- txhaj molding (cov khoom siv rov ua dua cov ntsiab lus tsawg dua lossis sib npaug li 15% los tiv thaiv kev txo qis hauv kev cuam tshuam).

 

Simplified Flowchart (Shortcut)

Raw khoom kom qhuav thiab sib tov → pwm clamping nyob rau hauv kev txhaj tshuaj molding tshuab → txhaj tshuaj → tuav siab → txias → ejection thiab ib feem tshem tawm → trimming thiab flash tshem tawm → laus thiab shaping → pre- kev kho mob rau tshuaj tsuag (degreasing thiab phosphating) → primer → base coat → coat accessories → clear coat → kev tshuaj xyuas qhov ntev thiab qhov tsos → lamination, ntim, thiab khaws cia